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Numerical aperture of microscope lens is...

Numerical aperture of microscope lens is expressed by

A

Angular aperture only

B

Refractive index only

C

Both angular aperture and refractive index

D

The wavelength of the light used

Text Solution

Verified by Experts

The correct Answer is:
C
Numerical aperture is defined as half of the aperture angle, the angle of the cone of light entering an objective.
`NA =1/2 nsin theta`
But the angle of the cone of light that can enter a lens depends directly on the refractive index
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